<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>逛水果店</title>
  </head>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    div {
      text-align: center;
    }
    table {
      margin: 0 auto
    }
  </style>
  <body>
    <div id="app">
      <h4>欢迎光临_vue开发的收银系统_水果店</h4>
      <table border="1" width="600" height="100">
        <tbody>
            <tr><td>苹果10￥/斤，折扣/《8折》</td></tr>
          <tr>
            <td>
              <span>请输入你要购买的斤数</span>
              <input type="number" placeholder="请输入斤数" v-model.number="goodCatty" />
            </td>
          </tr>
          <tr>
            <td><button @click="payMoney">结账买单</button></td>
          </tr>
          <tr><td>
            结账单：总价:{{totalPrice}}元 折后价:{{totalPrice * 0.8}}元 省了:{{totalPrice * 0.2}}元
          </td></tr>
        </tbody>
      </table>
    </div>
  </body>
</html>
<script src="vue.js"></script>
<script>
  new Vue({
    el: '#app',
    data: {
      goodCatty: 0,
      totalPrice: 0
    },
    methods: {
      payMoney(){
        this.totalPrice = parseInt(this.goodCatty.toFixed(2)* 100) / 10
      }
    }
  })
</script>